A pizza fetus.
The stork brings it.
However, there is always a threat that the stork may eat it,
which makes the Pizzus one of the most mythical feti ever
envisioned or hoped for.
When it shows up on the doorstep, uneaten, its like winning
an award or a marathon.

"Guess what arrived today? My first Pizzus!"
"Wow! The stork didn't eat it! You've hit the jackpot!"
"Yes, and that's why I'm calling in sick to work, so I can
throw a party for this little cheesy bundle of joy!"